[Backport 2.x] Add support for search using the "fields" parameter with knn_vector field #2411
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Description
Backport of #2314
Fix Sign-Off Issues/Test Failures in #2394
This change implements valueFetcher in KNNVectorFieldType so search can support using the "fields" parameter when used with the knn_vector field type. ITs for this change were added to OpenSearchIT after the change was tested manually.
Related Issues
Resolves #1633
Check List
--signoff
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